CN107784988A - The method of the local dimming of liquid crystal display device and liquid crystal display device - Google Patents

The method of the local dimming of liquid crystal display device and liquid crystal display device Download PDF

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Publication number
CN107784988A
CN107784988A CN201611248769.0A CN201611248769A CN107784988A CN 107784988 A CN107784988 A CN 107784988A CN 201611248769 A CN201611248769 A CN 201611248769A CN 107784988 A CN107784988 A CN 107784988A
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China
Prior art keywords
liquid crystal
crystal display
block
light modulation
gray level
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Granted
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CN201611248769.0A
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Chinese (zh)
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CN107784988B (en
Inventor
全虎敃
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LG Display Co Ltd
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LG Display Co Ltd
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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  • General Physics & Mathematics (AREA)
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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a kind of liquid crystal display device and the method for the local dimming of liquid crystal display device.The method of the local dimming of the liquid crystal display device includes：Image of the display with single gray level on liquid crystal display panel；Detect the generation light leakage among multiple pieces of liquid crystal display panel or the abnormal mass of black even (BU) defect；And calculate light modulation value for abnormal mass.Therefore, the light modulation value in each region for light leakage or black even defect to occur can be independently calculated, and the light modulation value calculated can apply to local dimming.Therefore, it is possible to reduce light leaks and can also solve black even defect.

Description

The method of the local dimming of liquid crystal display device and liquid crystal display device
The cross reference of related application
This application claims in Korea Spro 10-2016-0110941 for being submitted to Korean Intellectual Property Office on the 30th of August in 2016 The priority of state's patent application, the disclosure of which are incorporated herein by reference.
Technical field
Present disclosure is related to the method for the local dimming of liquid crystal display device and liquid crystal display device, and more specifically Ground, it is related to a kind of light leakage or the liquid crystal display of black even (BU) defect for being used for solution and occurring due to the characteristic of panel The method of the local dimming of device and the liquid crystal display device.
Background technology
Recently, as the world enters the information age, for visually showing that the display field of telecommunications information signal increases rapidly. Therefore, the high performance various flat display apparatus (flat of such as slimming, weight saving and low-power consumption are had been developed for Display device), and promptly substituting traditional cathode-ray tube (CRT).
Specifically, flat display apparatus can include liquid crystal display (LCD) device, organic light emitting display (OLED) device, Electrophoresis showed (EPD) device, plasma display (PDP) device and electrowetting show (EWD) device.Especially, in LCD In device, including the multiple liquid crystal cells being arranged in matrix liquid crystal display panel by adjust from back light unit provide The transmissivity of light carrys out display image.
The light transmittance that LCD device adjusts liquid crystal by using electric field carrys out display image.According to the side of the electric field of driving liquid crystal To LCD device can be divided into the driving LCD device of vertical electric field or the driving LCD device of horizontal component of electric field.Driven in vertical electric field In type LCD device, the public electrode formed on upper substrate and the pixel electrode formed on infrabasal plate are arranged to face each other Vertical electric field driving liquid crystal that is right, and being formed between them.The driving LCD device of vertical electric field has high aperture ratio, but Also there is narrow viewing angle.Meanwhile in the driving LCD device of horizontal component of electric field, forming pixel electrode and public affairs on the same substrate The horizontal component of electric field formed between common electrode can be with plane conversion (IPS) mode activated liquid crystal.The driving LCD device of horizontal component of electric field There is wide viewing angle and excellent colour gamut due to its dot structure.
However, compared with the driving LCD device of vertical electric field, in the driving LCD device of horizontal component of electric field, due to its pixel Structure, it is easier to light leakage occurs in the edge of liquid crystal display panel.In addition, in the driving LCD device of horizontal component of electric field, very May occur BU defects, BU defects mean black region unevenly formed in the whole surface of liquid crystal display panel and Partly there is bright spot.
Therefore, carrying out for solve the light in the driving LCD device of LCD device particularly horizontal component of electric field leakage and it is black The research of Color uniformity defect.
The content of the invention
The purpose to be realized of present disclosure is to provide a kind of following part of liquid crystal display device and liquid crystal display device The method of light modulation：It can by respectively to occur light leak region and do not occur light leakage region apply different light modulations Value come reduce due to light leak caused by irregularity in brightness.
Present disclosure another that to be realized purpose is to provide following a kind of liquid crystal display device and liquid crystal display device Local dimming method：It can be by respectively to occurring the region of black even defect and black even not occurring to lack Sunken region reduces black even defect using different light modulation values.
Present disclosure another that to be realized purpose is to provide following a kind of liquid crystal display device and liquid crystal display device Local dimming method：When by setting different light modulation values, analysis input data and for each picture for each piece When element applies gain to show the image with single gray level, there is uniform brightness.
The purpose of present disclosure is not limited to above-mentioned purpose, and from the following description, for ordinary skill For personnel, the other purposes being not mentioned above will be apparent.
According to present disclosure, embodiment there is provided a kind of method of the local dimming of liquid crystal display device.Liquid crystal The method of the local dimming of display device includes：Image of the display with single gray level on liquid crystal display panel；Detect liquid The abnormal mass that light leakage or black even defect occurs among multiple pieces of LCD panel；And calculate for abnormal mass Light modulation value.Therefore, the light modulation value in each region for light leakage or black even defect to occur can be independently calculated, And the light modulation value calculated can be applied to local dimming.Therefore, it is possible to reduce light leaks and can also to solve black equal Even property defect.
According to present disclosure another, embodiment there is provided a kind of liquid crystal display device.The liquid crystal display device bag Include：Include the liquid crystal display panel of multiple pixels；Back light unit including multiple light sources；And local dimming unit, it is based on Gray level light modulation value drives back light unit.Local dimming unit includes memory, is stored in the memory for liquid crystal panel Multiple pieces of gray level light modulation value.The generation light leakage or black that the memory storage of local dimming unit is used among multiple pieces The abnormal mass of Color uniformity defect and the different gray level light modulation values of reference block.Therefore, when to liquid crystal display device carry out office When portion dims, the light modulation value being stored in the memory of local dimming unit can be used.Light wherein occurs it is then possible to adjust The brightness of the abnormal mass of leakage or black even defect, therefore, it can be obtained on whole liquid crystal display panel uniform bright Degree.
According to present disclosure another, embodiment there is provided a kind of method of the local dimming of liquid crystal display device. The method of the local dimming of the liquid crystal display device includes：Image of the display with single gray level on liquid crystal display panel； Measure multiple pieces of brightness of liquid crystal display panel；And calculate light modulation value for the central block in multiple pieces and edge block. Here, calculating light modulation value includes applying different light modulations to central block and the edge block of the leakage of generation light or black even defect Value.Therefore, the light modulation value of main each edge block that light leakage or black even defect occurs can independently be calculated.Cause This, edge block is not applied identical light modulation value, but is employed have different light modulation values respectively.Therefore, it is possible to reduce light is let out Leak and can also solve black even defect.
The details of other illustrative embodiments is included within the detailed description and the accompanying drawings of the present invention.
According to present disclosure, adjust the block of generation light leakage based on measured brightness value and light leakage does not occur The light modulation value of block.Therefore, can solve to leak by the still unsolved light of method of conventional local dimming.
In addition, according to present disclosure, when black even is uneven, the block of liquid crystal display panel is applied not respectively Same light modulation value.Therefore, can solve equal by the black of the still unsolved liquid crystal display panel of method of conventional local dimming Even property defect.
In addition, according to present disclosure, while the block to liquid crystal display panel applies different light modulation values respectively, divide Analysis input data simultaneously applies gain.Therefore, uniform brightness can be obtained from multiple pieces.
The effect of present disclosure is not limited to the effect above, and various other effects are included in this manual.
Brief description of the drawings
In terms of according to the above and other that present disclosure with reference to the described in detail below of accompanying drawing, will be more clearly understood, Feature and other advantages, wherein：
Fig. 1 is the frame of the liquid crystal display device for illustrating the illustrative embodiments according to present disclosure provided Figure；
Fig. 2 is the circuit diagram of a part for the pel array for equally showing the liquid crystal display panel shown in Fig. 1；
Fig. 3 A are multiple pieces of the schematic diagrames for illustrating the liquid crystal display panel shown in Fig. 1 provided；
Fig. 3 B are schematic diagrames the problem of being used to illustrate to be caused by light leakage provided；
Fig. 3 C are schematic diagrames the problem of being used to illustrate to be caused by black even defect provided；
Fig. 4 is the office of the liquid crystal display device for illustrating the illustrative embodiments according to present disclosure provided The flow chart of the method for portion's light modulation；
Fig. 5 A are the liquid crystal display devices for illustrating the illustrative embodiments according to present disclosure provided In the method for local dimming, the perspective view for the processing being scanned to liquid crystal display panel；
Fig. 5 B are provided for illustrating the liquid crystal display device in the illustrative embodiments according to present disclosure Local dimming method in, by liquid crystal display panel show with the first gray level image and to LCD The schematic diagram for the brightness value that plate is scanned and obtained；
Fig. 5 C are provided for illustrating the liquid crystal display device in the illustrative embodiments according to present disclosure Local dimming method in, by liquid crystal display panel show with the second gray level image and to LCD The schematic diagram for the brightness value that plate is scanned and obtained；
Fig. 6 A are the figures of the example for the dimming curve for showing reference block；
Fig. 6 B are the figures of the example for the dimming curve for showing abnormal mass；
Fig. 7 is provided for illustrating the liquid crystal display device by the illustrative embodiments according to present disclosure Local dimming method set local dimming driving method flow chart；
Fig. 8 A are provided for illustrating the liquid crystal display in the another exemplary embodiment according to present disclosure In the method for the local dimming of device, by showing the image with the first gray level on liquid crystal display panel and to liquid crystal The schematic diagram for the brightness value for showing panel to be scanned and obtaining；And
Fig. 8 B are provided for illustrating the liquid crystal display in the another exemplary embodiment according to present disclosure In the method for the local dimming of device, by showing the image with the second gray level on liquid crystal display panel and to liquid crystal The schematic diagram for the brightness value for showing panel to be scanned and obtaining.
Embodiment
According to the illustrative embodiments described with reference to the accompanying drawings, the advantages of present disclosure will be more clearly understood and Feature, and the method for realizing the advantages and features.However, present disclosure is not limited to following exemplary embodiment, But it can be realized in the form of a variety of.Illustrative embodiments are provided just for the sake of completing the disclosure of present disclosure And the those of ordinary skill of the technical field of the open category involved by present disclosure fully provides for present disclosure Classification, and present disclosure will be defined by the following claims.
The shape that is shown in the accompanying drawing for describing the illustrative embodiments of present disclosure, size, ratio, angle The only example, and present disclosure not limited to this such as degree, number.In this manual, the usual table of similar reference Show similar element.In addition, in the following description, it is convenient to omit the detailed description to known correlation technique, it is unnecessary to avoid Ground obscures the theme of present disclosure.Unless term and term " only " are used together, otherwise terms used herein such as " bag Include ", " having " and " by ... form " be typically aimed at allow add miscellaneous part.Any reference to odd number can include plural number, Unless expressly stated otherwise,.
Part is illustrated as including common error range, even if not clearly stating.
When using such as " on ", " top ", " lower section " and " next " two parts of term description between position pass When being, one or more parts can be located between two parts, unless these terms are together with term " immediately " or " direct " Use.
When element or layer be referred to as another element or layer " on " when, its can directly on another element or layer, or There may be intermediary element or layer.
Although term " first ", " second " etc. are used to describe various parts, these parts are not limited by these terms System.These terms are only used for distinguishing a part and another part.Therefore, first component mentioned below can be in the disclosure Second component in the technological concept of appearance.
Throughout the specification, identical reference represents identical element.
Due to the size and thickness of each part that have been shown for illustration shown in accompanying drawing, present disclosure is not The size and thickness of each part shown in being necessarily limited to.
The feature of the various embodiments of present disclosure can partially or even wholly be bonded to each other or combine, and can Interlock and operate by a manner of technically various, and embodiment independently of one another or can be performed dependently of each other.
Hereinafter, the various illustrative embodiments of present disclosure be will be described in detail with reference to the accompanying drawings.
Fig. 1 is the frame of the liquid crystal display device for illustrating the illustrative embodiments according to present disclosure provided Figure.Fig. 2 is the circuit diagram of a part for the pel array for equally showing the liquid crystal display panel shown in Fig. 1.Reference picture 1 and figure 2, liquid crystal display device 100 includes the timing control of local dimming unit 111 including liquid crystal display panel 140, back light unit 160 Device 110, data driver 120, gate drivers 130 and system board 150 processed.
Liquid crystal display panel 140 is the driving liquid crystal display panel of horizontal component of electric field.The liquid crystal display panel is following IPS faces Plate：In the IPS panels, the horizontal component of electric field that is formed between pixel electrode and public electrode on the same substrate is formed with IPS mode activated liquid crystal.However, present disclosure not limited to this, and liquid crystal display panel 140 can be used as fringing field and open Close the driving liquid crystal display panel of horizontal component of electric field of (FFS) panel.
There is liquid crystal display panel 140 wherein liquid crystal layer to be arranged on the structure between substrate facing with each other.In liquid crystal On the infrabasal plate for showing panel 140, a plurality of data lines DL and a plurality of gate lines G L are intersected with each other.Due to data wire DL and gate lines G L Between chi structure, liquid crystal cells Clc is arranged on liquid crystal display panel 140 in the matrix form, as shown in Fig. 2 so as to limit Fixed multiple pixels.On the infrabasal plate of liquid crystal display panel 140, data wire DL, gate lines G L, thin film transistor (TFT) can be formed TFT, liquid crystal cells Clc the pixel electrode for being connected to thin film transistor (TFT) TFT, be connected to public pressure wire Vcom public electrode And storage Cst.In addition, on the upper substrate of liquid crystal display panel 140, black matrix and colour filter can be formed.
Polarization plates can be attached to each in the upper substrate and infrabasal plate of liquid crystal display panel 140.Furthermore, it is possible to Formed in the upper substrate and infrabasal plate of liquid crystal display panel 140 for set the pre-tilt angle of liquid crystal contacted with liquid crystal take To film.
Data driver 120 can include multiple source electrode driven integrated circuits (IC).Data driver 120 can be in timing control Latched digital video data R ' G ' B ' under the control of device 110 processed.In addition, positive/negative gamma compensated electricity can be used in data driver 120 Digital of digital video data R ' G ' B ' are converted to positive/negative analog data voltage by pressure, then provide positive/negative analog data voltage to number According to line DL.
Gate drivers 130 can include multiple raster data model IC.Gate drivers 130 can include shift register, For the swing width of the output signal of shift register to be converted to the swing width of the TFT suitable for driving liquid crystal cells Clc Level shifter, and output buffer.Gate drivers 130 include multiple raster data model IC, and therefore can order Ground output is respectively provided with the grid impulse (or scanning impulse) of the pulse width of about 1 horizontal cycle, and the grid impulse is carried It is supplied to gate lines G L.
Timing controller 110 can be with control data driver 120 and gate drivers 130.Timing controller 110 can lead to Interface (for example, low-voltage differential signal (LVDS) interface and minimum differential signal transmission (TMDS) interface) is crossed from system board 150 receive digital of digital video data RGB and timing signal Vsync, Hsync, DE and DCLK.Timing signal Vsync, Hsync, DE and DCLK can include vertical synchronizing signal Vsync, horizontal-drive signal Hsync, data enable signal DE and dot clock signal DCLK.Timing controller 110 can be produced based on timing signal Vsync, Hsync, DE and the DCLK inputted from system board 150 For control data driver 120 and the timing controling signal DDC and GDC of the operation timing of gate drivers 130.
Data timing control signal DDC can make including source electrode initial pulse SSP, source electrode sampling clock SSC, source electrode output Can signal SOE and polarity control signal POL.Source electrode initial pulse SSP can be operated with the data sampling of control data driver 120 Starting timing.Source electrode sampling clock SSC can be adopted based on rising edge or trailing edge come the data in control data driver 120 Sample operates.If the signal transmission system between timing controller 110 and data driver 120 is miniature LVDS interface, can To omit source electrode initial pulse SSP and source electrode sampling clock SSC.Polarity control signal POL can be in n (n is positive integer) individual water The polarity for the data voltage that reversion exports from data driver 120 at mean period.Source electrode output enable signal SOE can control number According to the output timing of driver 120.
Grid timing controling signal can include grid initial pulse GSP, gate shift clock GSC and grid output is enabled Signal GOE.Grid initial pulse GSP can control the timing of first grid pulse.Gate shift clock GSC is to be used to shift grid Pole initial pulse GSP clock signal.Grid output enable signal GOE can be with the output timing of control gate driver 130.
Input picture can be mapped to multiple pieces of liquid crystal display panel 140 by timing controller 110, and analyze each The correlation between backlight and view data in block.Timing controller 110 is according to the correlation between view data and backlight The dim signal DIM for local dimming of back light unit 160 is exported, and compensates the data of each block.
Timing controller 110 can include local dimming unit 111, be used for local dimming with export back light unit 160 Dim signal DIM.However, present disclosure not limited to this, local dimming unit 111 may be implemented as and timing controller The component of 110 separation.Local dimming unit 111 includes memory, is stored in the memory for the multiple of liquid crystal panel 140 The gray level light modulation value of block.Memory can store among multiple pieces occur light leakage or black even defect it is different The different gray level light modulation values of normal block and reference block.Local dimming unit 111 can be based on light modulation value output dim signal DIM To drive back light unit 160.The more details of local dimming unit 111 are described later with reference to Fig. 3 A to Fig. 8 B.
Digital of digital video data RGB is supplied to timing controller 110 by system board 150.System board 150 connects including broadcast singal Receive circuit, external apparatus interface circuit, graphic processing circuit etc..Therefore, system board 150 is configured as from defeated via external equipment The input source or broadcast signal reception video data entered, converts video data to numerical data, and numerical data is supplied to Timing controller 110.System board 150 can provide such as vertical synchronizing signal Vsync, horizontal synchronization to timing controller 110 Signal Hsync, data enable signal DE and dot clock signal DCLK timing signal.
Back light unit 160 can include multiple light sources.Back light unit 160 may be implemented as Staight downward type backlight unit or side Edge type back light unit.Staight downward type backlight unit has following structure：In the multiple optical sheets of 140 times stackings of liquid crystal display panel and overflow Penetrate plate and multiple light sources are set below diffusing panel.Staight downward type backlight unit can be by being arranged on diffusing panel by multiple light sources Lower section and multiple light sources are controlled to realize local dimming respectively.Edge type backlight unit has following structure：Light source is arranged to It is arranged in face of the side surface of light guide plate and multiple optical sheets between liquid crystal display panel 140 and light guide plate.Multiple optical sheets Including at least one prismatic lens and at least one diffusion disk.Therefore, optical sheet diffusion is from the incident light of diffusing panel, and with liquid crystal The travel path of the substantially vertical angle refraction light of the light incident surface of display panel 140.Multiple optical sheets may include double brightness Strengthen film (DBEF).
Hereinafter, reference picture 3A to Fig. 8 descriptions are used for minimum according to the illustrative embodiments of present disclosure The method for changing the light leakage in liquid crystal display panel 140 and the local dimming of black even defect.
Fig. 3 A are multiple pieces of the schematic diagrames for illustrating the liquid crystal display panel shown in Fig. 1 provided.
Reference picture 3A, liquid crystal display panel 140 include the multiple pieces of B11 to B57 for local dimming.Block B11 to B57 that This does not have physical separation, but they are the dummy blocks for virtually separating the whole region of liquid crystal display panel 140.Fig. 3 A Show that liquid crystal display panel 140 includes multiple pieces of B11 to B57 of five (5) row and seven (7) row, but not limited to this.Liquid crystal Show that panel 140 can include multiple pieces of certain number of row and certain number of row.Each in multiple pieces of B11 to B57 The pixel of i × j (i and j is equal to or the positive integer more than 1) number can be included.Each pixel can include three (3) primary colors or The sub-pixel of more primary colors, and each sub-pixel can include liquid crystal cells Clc.
Fig. 3 B are schematic diagrames the problem of being used to illustrate to be caused by light leakage provided.Fig. 3 C are provided for saying The schematic diagram of bright the problem of being caused by black even defect.Fig. 3 B and Fig. 3 C are that the explanation that is used for provided is worked as in liquid crystal display Display has a case that light leakage and the signal of black even defect occurs during the image of single gray level respectively on panel 140 Figure.The brightness value that the shadow representation of each block in block B11 to B57 measures from relevant block.That is, with identical shade Block is to measure the block of same brightness value from it, and the block with different shades is to measure the block of different brightness values from it.In addition, Shadeless piece is normal blocks.Here, the image with single gray level refers to the gray level identical image of whole image.
Reference picture 3B, light leakage may occur in liquid crystal display panel 140.In this case, in LCD Block B11, B12 of the edge of plate 140, B13, B14, B15, B16, B17, B21, B27, B31, B37, B41, B47, B51, B52, B53, B54, B55, B56 and B57 and it there may be luminance difference between the block B34 at the center of liquid crystal display panel 140.Specifically Ground, image of the display with particular gray level on liquid crystal display panel 140, if on the side of liquid crystal display panel 140 At edge occur light leakage, then from block B11, B12 of the edge of liquid crystal display panel 140, B13, B14, B15, B16, B17, B21, B27, B31, B37, B41, B47, B51, B52, B53, B54, B55, B56 and B57 measurement brightness value can be differently configured from from The brightness value of block B34 measurements at the center of liquid crystal display panel 140.In this case, on the side of liquid crystal display panel 140 User may have different visual experiences between edge and center.Therefore, it is desirable to reduce light leaks.
Then, reference picture 3C, black even defect may occur in liquid crystal display panel 140.In this case, Luminance difference is there may be among multiple pieces of B11 to B57 of liquid crystal display panel 140.Specifically, even in liquid crystal display panel Image of the display with particular gray level on 140, because the black even on liquid crystal display panel 140 is uneven, Various brightness values can be measured from multiple pieces of B11 to B57.Especially, can be from the edge of liquid crystal display panel 140 Block B11, B12, B13, B14, B15, B16, B17, B21, B27, B31, B37, B41, B47, B51, B52, B53, B54, B55, B56 Various brightness values are measured with B57.If black even defect occurs in liquid crystal display panel 140 and so from multiple Block B11 to B57 measures different brightness values, then user may have visual experience, contrast (CR), black gray level image Grey scale table the problem of reaching.Therefore, it is necessary to solve black even defect.
In the method for the local dimming of the liquid crystal display device 100 of the illustrative embodiments according to present disclosure, Light modulation value is independently applied to the abnormal mass that light leakage or black even defect occurs, so that light leakage is minimized and solved Black even defect.
Fig. 4 is the office of the liquid crystal display device for illustrating the illustrative embodiments according to present disclosure provided The flow chart of the method for portion's light modulation.
First, image (S10) of the display with single gray level on liquid crystal display panel 140.
Image of the display of liquid crystal display panel 140 with single gray level, to measure the multiple of liquid crystal display panel 140 Block B11 to B57 brightness.That is, with the minimum gray level that may be displayed on liquid crystal display panel 140 to highest The image of one of gray level in grey level range is shown on liquid crystal display panel 140.For example, in liquid crystal display panel 140 Upper image of the display with the particular gray level from 0 to 255.Therefore, can be based on the figure being shown on liquid crystal display panel 140 The abnormal mass of light leakage or black even defect occurs to detect for the gray level of picture.
Each have in addition, liquid crystal display panel 140 can be sequentially displayed from minimum gray level to highest gray level model The multiple images of one of gray level in enclosing.For example, can be shown on liquid crystal display panel 140 each has the model from 0 to 255 The multiple images of one of gray level in enclosing.Therefore, can be based on each gray scale that may be displayed on liquid crystal display panel 140 The abnormal mass of light leakage or black even defect occurs to detect for level.Here it is possible to liquid will be shown in a variety of ways by setting The order of the gray level of multiple images on LCD panel 140.That is, liquid crystal display panel 140 can according to from 0 to The order of 255 gray level shows multiple images, or can show multiple images according to the order of the gray level from 255 to 0. In addition, liquid crystal display panel 140 can randomly show multiple figures of one of the respective gray level having in the range of from 0 to 255 Picture.
It is then detected that light leakage or black even occur among multiple pieces of B11 to B57 of liquid crystal display panel 140 The abnormal mass (S20) of defect.Reference picture 5A is more fully described to the processing of detection abnormal mass.
Fig. 5 A are the liquid crystal display devices for illustrating the illustrative embodiments according to present disclosure provided The perspective view of the processing being scanned to liquid crystal display panel in the method for local dimming.
First, when showing the image with single gray level on liquid crystal display panel 140 as described above, to liquid crystal Show that panel 140 performs scan process.For example, as shown in Figure 5A, when display has single gray level on liquid crystal display panel 140 Image when, can use scanner 900 to liquid crystal display panel 140 perform surface scan handle.As surface scan processing Result, multiple pieces of B11 to B57 of liquid crystal display panel 140 brightness value can be measured.
In the exemplary embodiment, the scan process of liquid crystal display panel 140 may be performed that and liquid crystal display Embedded (in-line) processing of the manufacture processing of panel 140 together.That is, scanner 900 can be arranged on for producing At the production line of liquid crystal display panel 140, and when liquid crystal display panel 140 is arranged to correspond to scanner 900, display Image.Then, while liquid crystal display panel 140 moves along production line, the scanning being arranged at production line can be used Instrument 900 is scanned processing to liquid crystal display panel 140.So, if scan process is performed as and liquid crystal display panel 140 Manufacture processing inline processed together, then scanning can be more efficiently carried out by the automatic production of liquid crystal display panel 140 Processing.
, can be with liquid crystal display panel to the scan process of liquid crystal display panel 140 in another exemplary embodiment 140 manufacture processing dividually performs.That is, after completing to manufacture liquid crystal display panel 140, scan process can be by Perform the processing of the separation to be performed using scanner 900 to liquid crystal display panel 140.
By above-mentioned scan process, multiple pieces of B11 to B57 can be measured on being shown on liquid crystal display panel 140 The brightness value of the gray level of image.For example, there is the first gray level if displayed on the image on liquid crystal display panel 140, then Brightness values of the multiple pieces of B11 to B57 on the first gray level can be measured.Here, the brightness value of particular value can be from specific The average value of the brightness value of block measurement.However, present disclosure not limited to this.The brightness value of particular value can be defined as each The mode of brightness value, or can define in another way.
If in addition, as described above, being shown on liquid crystal display panel 140 each has the ash from minimum gray level to highest The multiple images of one of the gray level spent in the range of level, then can perform scan process while each image is shown.Therefore, On each gray level brightness value can be measured from multiple pieces of B11 to B57 of liquid crystal display panel 140.For example, can according to The order of gray level from 0 to 255 performs scan process while showing multiple images successively.Therefore, liquid crystal can be measured Show brightness values of multiple pieces of B11 to the B57 of panel 140 on each gray level from 0 to 255.
Then, based on the brightness value measured by scan process, the abnormal mass among multiple pieces of B11 to B57 is detected.Will The processing of detection abnormal mass is more fully described in reference picture 5B and Fig. 5 C.
Fig. 5 B are provided for illustrating the liquid crystal display device in the illustrative embodiments according to present disclosure Local dimming method in, by liquid crystal display panel show with the first gray level image and to LCD The schematic diagram for the brightness value that plate is scanned and obtained.Fig. 5 B are shown by showing there is the on liquid crystal display panel 140 The image of one gray level and the exemplary plot for the brightness value for performing scan process and obtaining.The moon in each in block B11 to B57 Shadow represents the brightness value from relevant block measurement.That is, the block with identical shade is to measure same brightness value from it Block, the block with different shades is to measure the block of different brightness values from it.In addition, shadeless piece is normal blocks.
Based on the brightness value measured by scan process, can be detected among multiple pieces of B11 to B57 on the first ash Spend the abnormal mass of level.Abnormal mass in multiple pieces of B11 to B57 can have the brightness value different from reference block RB brightness value Block.Here, reference block RB can be the block B34 at the center of liquid crystal display panel 140 among multiple pieces of B11 to B57. Light leakage and black even defect mainly occur in the edge of liquid crystal display panel 140.Therefore, liquid crystal display panel 140 Center at block B34 be likely to normal blocks.Therefore, the number of abnormal mass can from the center of liquid crystal display panel 140 to Edge increase.Therefore, the reference block RB for detecting abnormal mass can be located at liquid crystal display among multiple pieces of B11 to B57 Block B34 at the center of panel 140.
Among multiple pieces of B11 to B57, the block with the brightness value different from reference block RB brightness value is detected as closing In the abnormal mass of the first gray level level.For example, in the illustrative embodiments shown in Fig. 5 B, shaded block B11, B12, B13, B14, B15, B16, B17, B21, B23, B27, B31, B37, B41, B42, B45, B47, B51, B52, B53, B54, B55, B56 and B57 is detected as the abnormal mass on the first gray level.
Fig. 5 C are provided for illustrating the liquid crystal display device in the illustrative embodiments according to present disclosure Local dimming method in, by liquid crystal display panel show with the second gray level image and to LCD The schematic diagram for the brightness value that plate is scanned and obtained.Fig. 5 C are shown by showing there is the on liquid crystal display panel 140 The image of two gray levels and the exemplary plot for the brightness value for performing scan process and obtaining.The moon in each in block B11 to B57 Shadow represents the brightness value from relevant block measurement.That is, the block with identical shade is to measure same brightness value from it Block, the block with different shades is to measure the block of different brightness values from it.In addition, shadeless piece is normal blocks.
Based on the brightness value measured by scan process, can detect grey on first among multiple pieces of B11 to B57 Spend the abnormal mass of level.That is, can be on the minimum gray level on it may be displayed on liquid crystal display panel 140 to highest Second gray levels different from the first gray level in multiple gray levels in the range of gray level detect abnormal mass.On The processing of two gray levels detection abnormal mass and the processing on the first gray level detection abnormal mass are essentially identical.It is that is, different Normal block can be the block with the brightness value different from reference block RB brightness value among multiple pieces of B11 to B57.Reference block RB Can be the block B34 at the center of liquid crystal display panel 140 among multiple pieces of B11 to B57.
When image has the second gray level different from the first gray level, measure bright from multiple pieces of B11 to B57 Degree.Can be different from the abnormal mass on the second gray level accordingly, with respect to the abnormal mass of the first gray level.That is, depend on In the gray level for the image being shown on liquid crystal display panel 140, light leakage and black even may occur in a different manner Property defect.Therefore, it is different detected by the brightness measured when there is the image of the first gray level based on display as shown in Figure 5 B Normal block can be differently configured from detected by the brightness measured when having the image of the second gray level based on display as shown in Figure 5 C Abnormal mass.For example, abnormal mass may be not detected as in figure 5 c by being detected as the second abnormal mass AB2 block B23 in figure 5b.This Outside, the 3rd abnormal mass AB3 may be detected as in figure 5 c by not being detected as the block B36 of abnormal mass in figure 5b.It is however, multiple Some blocks (such as block B11) in block B11 to B57 may be detected as the first abnormal mass AB1 in Fig. 5 B and Fig. 5 C.
Fig. 5 B and Fig. 5 C show that the abnormal mass on the first gray level is different from the abnormal mass on the second gray level, but Being can be identical with the abnormal mass on the second gray level on the abnormal mass of the first gray level.For each liquid crystal display panel 140, if abnormal mass be present (i.e., if light leakage and black even defect occur in liquid crystal display panel 140) can be with It is different.Therefore, in specific panel of LCD 140, the abnormal mass on the first gray level can be differently configured from pass In the abnormal mass of the second gray level.In another liquid crystal display panel 140, on the first gray level abnormal mass can with The abnormal mass of second gray level is identical.
Can be detected in a manner of with aforesaid way identical among multiple pieces of B11 to B57 on from minimum gray level The abnormal mass of each gray level in highest grey level range.That is, can be on each gray level from 0 to 255 Above-mentioned detection process is repeated, to detect the abnormal mass on all gray levels.
Then, the light modulation value (S30) for abnormal mass is calculated.
It is used for the light modulation value of abnormal mass based on the brightness calculation measured on each gray level.That is, for wherein Light occurs to leak and measure the abnormal mass of the brightness different from reference block RB brightness or black even defect occurs And the abnormal mass of the brightness different from reference block RB brightness is measured, using the tune different from reference block RB dimming curve Light curve.Therefore, the light modulation value for abnormal mass is calculated so that all pieces of B11 to B57 of liquid crystal display panel 140 are identical There is identical brightness at gray level, and ensure black even.Therefore, as among multiple pieces of B11 to B57 at center Block B34 reference block RB can have with edge and wherein occur light leakage or black even defect block B11, B12, B13, B14, B15, B16, B17, B21, B27, B31, B37, B41, B47, B51, B52, B53, B54, B55, B56 and B57 light modulation is worth different light modulation values.
Below equation is used to calculate the light modulation value for abnormal mass.
[equation]
For abnormal mass light modulation value=(from abnormal mass measurement brightness/from reference block measurement brightness) * be used for refer to The light modulation value of block
There may be the reference dimming curve for liquid crystal display device 100, to drive liquid crystal in a manner of local dimming Display device 100.Refer to the dimming curve for reference block RB with reference to dimming curve.Here, even if described above in liquid crystal Show image of the display with same grey level on panel 140, can also be from multiple pieces due to light leakage and black even defect Each in B11 to B57 measures different brightness.Therefore, in the liquid of the illustrative embodiments according to present disclosure In the method for the local dimming of LCD panel 140, above-mentioned equation can be used respectively to abnormal mass and reference block RB using not Same light modulation value.
For example, from reference block RB measurement the brightness on the first gray level can be Y1, from abnormal mass measurement on The brightness of first gray level can be Y2, and can be X% for the reference block RB light modulation value on the first gray level. In this case, the light modulation value on the first gray level for abnormal mass is calculated as (Y2/Y1) * X%.For example, from reference The brightness on the first gray level of block RB measurements can be higher than the brightness from abnormal mass measurement.In this case, for different The light modulation value on the first gray level of normal block is less than the light modulation value on the first gray level for reference block RB.With this phase Instead, the brightness from abnormal mass measurement can be less than from the brightness on the first gray level of reference block RB measurements.In such case Under, the light modulation value on the first gray level for abnormal mass is higher than the light modulation on the first gray level for reference block RB Value.
The processing that each gray level repeatedly calculates the light modulation value for abnormal mass using above-mentioned equation can be directed to.Example Such as, the light modulation on each gray level from 0 to 255 for the block for being detected as abnormal mass can be calculated using above-mentioned equation Value.It is consequently possible to calculate unique light modulation value for each block in block B11 to B57, and it is bent to be denoted as light modulation Line.
In addition, when calculating the light modulation value for abnormal mass using equation, light modulation value can be independently applied on side Block B11, B12, B13, B14, B15, B16, B17, B21, B27, B31, B37, B41, B47, B51, B52, B53, B54 at edge, Each block in B55, B56 and B57.For example, respectively from block B11, B12 of edge, B13, B14, B15, B16, B17, Block B11 and block B17 measurements among B21, B27, B31, B37, B41, B47, B51, B52, B53, B54, B55, B56, B57 is different Brightness value.Therefore, the first light modulation value can be applied to block B11, and block B17 can be applied different from the first light modulation value Second light modulation value.Therefore, different dimming curves can be applied to block B11 and block B17 respectively.
Fig. 6 A are the figures of the example for the dimming curve for showing reference block.Fig. 6 B are the examples for the dimming curve for showing abnormal mass Figure.For example, Fig. 6 A show the example of the dimming curve of the reference block RB shown in Fig. 5 B and Fig. 5 C, and Fig. 6 B are shown It is illustrated as the example of the first abnormal mass AB1 block B11 dimming curve in Fig. 5 B and Fig. 5 C.In Fig. 6 A and Fig. 6 B figure, X-axis The gray level of block typical value, i.e. input picture is represented, Y-axis represents light modulation value (%).In fig. 6b, show and be used for by a dotted line Reference block RB dimming curve, and in order to compare the dimming curve shown by solid line for the first abnormal mass AB1.
, can be with as described above, when calculating the light modulation value for abnormal mass on each gray level using above-mentioned equation Different dimming curves is applied to the first abnormal mass AB1 and reference block RB respectively, as shown in Figure 6B.For example, as shown in Figure 6B, At gray level less than A, the light modulation value for the first abnormal mass AB1 can be higher than the light modulation value for reference block RB.In addition, At gray level between A and B, the light modulation value for the first abnormal mass AB1 can be less than the light modulation value for reference block RB.This Outside, at the gray level higher than B, the light modulation value for the first abnormal mass AB1 can be higher than the light modulation value for reference block RB.
Furthermore, it is possible to different dimming curves is set for each abnormal mass.That is, as described above, abnormal mass is every There can be different brightness at individual gray level, and the block of abnormal mass is detected as in another gray level at particular gray level Place may be detected as normal blocks.Therefore, can be the setting of each in multiple pieces of B11 to B57 of liquid crystal display panel 140 Different dimming curves.
Then, the light modulation value calculated can be stored in liquid crystal display device 100.
Specifically, the light modulation values that is calculated of the multiple pieces of B11 to B57 of liquid crystal display panel 140 on each gray level It can be stored in the local dimming unit 111 of driving back light unit 160.That is, the light modulation value calculated can store In the memory of local dimming unit 111.However, present disclosure not limited to this.The light modulation value calculated can be stored in In some the addressable memory of local dimming unit 111, to drive back light unit 160.
Fig. 7 is that the explanation that is used for provided passes through liquid crystal display device according to the illustrative embodiments of present disclosure Local dimming method set local dimming driving method flow chart.
First, local dimming unit 111 receives input data (S110).
The timing controller 110 of liquid crystal display device 100 receives input data, i.e. digital of digital video data from system board 150 RGB.Here, input data is defined as the data of the frame on input picture.If local dimming unit 111 be included in as In timing controller 110 shown in Fig. 1, then local dimming unit 111 can use the input number received by timing controller 110 According to.If local dimming unit 111 is arranged on outside timing controller 110, local dimming unit 111 can be from timing controlled Device 110 receives input data.
Then, local dimming unit 111 sets typical value based on input data for each in multiple pieces of B11 to B57 (S120)。
Local dimming unit 111 enters data to set for each piece by analyzing each block of liquid crystal display panel 140 Put typical value.Local dimming unit 111 can be from the maximum gray scale value of each pixel in input data detection frame and right The maximum gray scale value for being included in each pixel in each piece of B11 to B57 is averaged.Therefore, can be by each piece it is flat Average is arranged to block typical value.However, present disclosure not limited to this.The mode of each block can be configured to block typical value, Or it can make alternatively to set block typical value.
Then, local dimming unit 111 is based on the light modulation value corresponding with typical value, on multiple pieces of B11 into B57 Each control back light unit 160 (S130).
As described above, the light modulations that is calculated of the multiple pieces of B11 to B57 of liquid crystal display panel 140 on each gray level Value can be stored in local dimming unit 111, such as is stored in the memory of local dimming unit 111.Then, local dimming Unit 111 can be based on the light modulation value corresponding with storing block typical value in memory, on multiple pieces of B11 into B57 Each block, it is determined that the local dimming value for each block.Local dimming unit 111 is used for each block determined by can using Local dimming value come be directed in multiple pieces of B11 to B57 of liquid crystal display panel 140 each driving back light unit 160, and And therefore control the backlight illumination of each block.
Then, light distribution data of the local dimming unit 111 based on multiple light sources calculate the yield value for multiple pixels (S140)。
For example, previously positioned light distribution data selection is the light modulation value for each block by local dimming unit 111, and Calculate the light quantity of each pixel in specific piece.Light distribution data can be calculated as during local dimming from specific pixel Adjacent pixel reaches the light quantity of specific pixel and the light quantity sum of specific pixel.Otherwise, can by following earlier experiments come Calculate light distribution data：The earlier experiments are used to perform local dimming by using each piece of light modulation value to measure each pixel Brightness.Local dimming unit 111 can be based on when whole backlight is had a high-high brightness by light distribution data from specific pixel The light quantity sum that adjacent multiple light sources reach specific pixel is calculated as the first light summation.In addition, local dimming unit 111 can be with Each light quantity of specific pixel is reached by using being multiplied by each piece of light modulation value from multiple light sources and by results added, meter Calculate second total light that specific pixel when adjusting the brightness of backlight for each block according to light modulation value, is reached from multiple adjacent light sources Amount.Then, local dimming unit 111 can calculate the increasing of specific pixel using the ratio of the first light summation and the second light summation Benefit value.However, the processing of above-mentioned calculating yield value is example, and can change in a variety of ways.
Then, local dimming unit 111 compensates input data (S150) based on yield value.
Local dimming unit 111 compensates respective pixel using the yield value calculated for each in multiple pixels Input data.For example, local dimming unit 111 can be by making the input data of each in multiple pixels and for corresponding The yield value that pixel calculates is multiplied to compensate input data.Input data, the i.e. digital of digital video data R ' G ' compensated as described above B ' can be supplied to data driver 120 by timing controller 110.
As described above, light leakage and black even defect may occur in liquid crystal display panel 140.Especially, exist Block B11, B12 of the edge of liquid crystal display panel 140, B13, B14, B15, B16, B17, B21, B27, B31, B37, B41, B47, B51, B52, B53, B54, B55, B56 and B57 and the block B34 at center can have luminance difference.If so exist Luminance difference, then user may have visual sense feeling, contrast (CR), the gray level of image expression the problem of.Particularly, if The liquid crystal display panel 140 of liquid crystal display device 100 is the driving liquid crystal display panel of horizontal component of electric field of such as IPS panels, then It is likely occurred light leakage or black even defect.
Therefore, in the liquid crystal display device 100 and liquid crystal display device of the illustrative embodiments according to present disclosure Local dimming method in, light modulation value can be separately provided for following abnormal mass：Occurs light leakage in the abnormal mass Or black even defect and measured from the abnormal mass bright with reference block RB (that is, normal blocks) at same gray level The different brightness value of angle value.Light modulation value can store in memory.Therefore, when driving liquid crystal display device 100, it is contemplated that Light leaks or black even defect, the dimming curve stored in memory is applied to each in multiple pieces of B11 to B57 It is individual.Then, the input data of each pixel is compensated.Therefore, it is possible to reduce the light leakage in liquid crystal display panel 140, and can To improve black even.Therefore, if showing single gray level on the liquid crystal display panel 140 of liquid crystal display device 100 Image, then can measure identical brightness value from multiple pieces of B11 to B57 of liquid crystal display panel 140.
Fig. 8 A are provided for illustrating the liquid crystal display in the another exemplary embodiment according to present disclosure In the method for the local dimming of device, by showing the image with the first gray level on liquid crystal display panel and to liquid crystal The schematic diagram for the brightness value for showing panel to be scanned and obtaining.Fig. 8 A are shown by showing tool on liquid crystal display panel 140 There are the image of the first gray level and the exemplary plot for the brightness value for performing scan process and obtaining.Fig. 8 A are shown it is determined that reference block The illustrative embodiments different from the illustrative embodiments shown in Fig. 5 B in RB method.
Abnormal mass among multiple pieces of B11 to B57 can have the brightness different from the brightness measured from reference block RB Block.Here, reference block RB can be have it is corresponding with the mode in the brightness measured respectively from multiple pieces of B11 to B57 The block of brightness.Light leakage and black even defect mainly occur in the edge of liquid crystal display panel 140.Therefore, it is arranged in Pericentral most of block of liquid crystal display panel 140 is likely to normal blocks.Therefore, have with working as in liquid crystal display panel It can be reference that display, which has the block of brightness value corresponding to the mode in the brightness value measured during the image of single gray level, on 140 Block RB.In the illustrative embodiments shown in Fig. 8 A, block B22, B24 of non-shadow, B25, B26, B32, B33, B34, B35, The number into B57 is maximum in multiple pieces of B11 by B36, B43, B44 and B46.Therefore, non-shadow block B22, B24, B25, B26, B32, B33, B34, B35, B36, B43, B44 and B46 can be defined as reference block RB.
The block with the brightness different from the brightness measured from reference block RB in multiple pieces of B11 to B57 is detected as closing In the abnormal mass of the first gray level.For example, in the illustrative embodiments shown in Fig. 8 A, shaded block B11, B12, B13, B14, B15, B16, B17, B21, B23, B27, B31, B37, B41, B42, B45, B47, B51, B52, B53, B54, B55, B56 and B57 It is detected as the abnormal mass on the first gray level.
Fig. 8 B are provided for illustrating the liquid crystal display in the another exemplary embodiment according to present disclosure In the method for the local dimming of device, by showing the image with the second gray level on liquid crystal display panel and to liquid crystal The schematic diagram for the brightness value for showing panel to be scanned and obtaining.Fig. 8 B are shown by showing tool on liquid crystal display panel 140 There are the image of the second gray level and the exemplary plot for the brightness value for performing scan process and obtaining.Fig. 8 B are shown it is determined that reference block The illustrative embodiments different from the illustrative embodiments shown in Fig. 5 C in RB method.
Abnormal mass among multiple pieces of B11 to B57 can have the brightness different from the brightness measured from reference block RB Block.As described above, reference block RB can be have it is relative with the mode in the brightness measured respectively from multiple pieces of B11 to B57 The block for the brightness answered.Therefore, in the illustrative embodiments shown in Fig. 8 B, block B22, B23 of non-shadow, B24, B26, B32, The number into B57 is maximum in multiple pieces of B11 by B33, B34, B35, B42, B43, B44, B45 and B46.Therefore, non-shadow block B22, B23, B24, B26, B32, B33, B34, B35, B42, B43, B44, B45 and B46 can be defined as reference block RB.
In the method for the local dimming of the liquid crystal display device of the another exemplary embodiment according to present disclosure, Block with the corresponding brightness of the mode in the brightness with being measured respectively from multiple pieces of B11 to B57 is arranged to reference block RB. That is, light leakage and black even defect occur mainly in liquid crystal display panel 140 edge block B11, B12, In B13, B14, B15, B16, B17, B21, B27, B31, B37, B41, B47, B51, B52, B53, B54, B55, B56 and B57, because This, most several piece is likely to normal blocks.Therefore, the block with brightness corresponding with mode can be defined as reference block RB. Therefore, black even defect occurs in the block at the center of liquid crystal display panel 140, can also normally detects different Normal block, and can also normally calculate the light modulation value for abnormal mass.
According to the local dimming of the liquid crystal display device of the illustrative embodiments of present disclosure and liquid crystal display device Method can also be described as follows.
A kind of method of the local dimming of liquid crystal display device can include：Display has single on liquid crystal display panel The image of gray level；Detect in multiple pieces of liquid crystal display panel generation light leakage or black even (BU) defect it is different Normal block；And calculate light modulation value for abnormal mass.
According to the another aspect of present disclosure, display image, which can include display, each to be had from minimum gray level to most The multiple images of one of gray level in the range of high grade grey level.Detecting abnormal mass can include on each gray scale in gray level Abnormal mass among multiple pieces of level detection.
According to the another aspect of present disclosure, calculating can include in gray level for the light modulation value of abnormal mass Each gray level calculates the light modulation value for abnormal mass.
According to the another aspect of present disclosure, detection abnormal mass can include the liquid crystal display by scanning display image Panel measures the brightness of each block in multiple pieces.
According to the another aspect of present disclosure, detection abnormal mass can include by multiple pieces have with from reference block The block of the different brightness of the brightness of measurement is detected as abnormal mass.
According to the another aspect of present disclosure, calculate by the light modulation value of abnormal mass can be including the use of below equation based on Calculate the light modulation value for abnormal mass.
[equation]
For abnormal mass light modulation value=(from abnormal mass measurement brightness/from reference block measurement brightness) * be used for refer to The light modulation value of block
According to the another aspect of present disclosure, reference block can be at the center of the liquid crystal display panel among multiple pieces Block.
According to the another aspect of present disclosure, reference block can be the block for having following brightness：The brightness with from multiple Mode in the brightness that block measures respectively is corresponding.
A kind of liquid crystal display device can include：Include the liquid crystal display panel of multiple pixels；The back of the body including multiple light sources Light unit；And local dimming unit, it includes memory of the storage for multiple pieces of gray level light modulation value of liquid crystal panel And based on gray level light modulation value driving back light unit.The leakage of generation light or the black even that memory storage is used in multiple pieces The abnormal mass of defect and the different gray level light modulation values of reference block.
According to the another aspect of present disclosure, local dimming unit may be configured to：Receive liquid crystal display panel Input data；The typical value of each block in multiple pieces is set based on input data；Based on the light modulation value corresponding with typical value, Back light unit is controlled on each block in multiple pieces；Light distribution data based on multiple light sources calculate the increasing for multiple pixels Benefit value；And input data is compensated based on yield value.
According to the another aspect of present disclosure, the number of abnormal mass can increase from the center of liquid crystal display panel to edge Add.
According to the another aspect of present disclosure, liquid crystal display panel can be plane conversion (IPS) panel.
According to the another aspect of present disclosure, liquid crystal display device also includes being used for the driving for controlling liquid crystal display panel Timing controller.Local dimming unit can be included in timing controller.
According to the another aspect of present disclosure, if figure of the display with single gray level on liquid crystal display panel Picture, then it can measure identical brightness value from multiple pieces.
A kind of method of the local dimming of liquid crystal display device can include：Display has single on liquid crystal display panel The image of gray level；Measure multiple pieces of brightness of liquid crystal display panel；And calculate for the central block among multiple pieces and The light modulation value of edge block.The edge block of light leakage or black even defect can be included to central block and occur by calculating light modulation value Using different light modulation values.
According to the another aspect of present disclosure, opposite side can be included using different light modulation values to central block and edge block Each edge block in edge block independently applies light modulation value.
According to another aspect of the invention, each edge block in edge blocks independently using light modulation value can include pair Some edge blocks apply the first light modulation value, and apply the second light modulation value different from the first light modulation value to other edge blocks.
Although the illustrative embodiments of present disclosure have been described in detail with reference to the accompanying drawings, present disclosure is not It is limited to this, and can be embodied in many different forms in the case where not departing from the technological concept of present disclosure.Therefore, The illustrative embodiments of offer present disclosure are solely for the purpose of illustration, and are not intended to the technology of limitation present disclosure Concept.The scope not limited to this of the technological concept of present disclosure.The protection domain of present disclosure should be based on following right It is required that to understand, and all technological concepts in its equivalency range be appreciated that fall into scope of the present disclosure It is interior.

Claims (17)

1. a kind of method of the local dimming of liquid crystal display device, methods described include：
Image of the display with single gray level on liquid crystal display panel；
The abnormal mass that occurs light leakage or black even defect of the detection among multiple pieces of the liquid crystal display panel；With And
Calculate the light modulation value for the abnormal mass.
2. the method for the local dimming of liquid crystal display device according to claim 1, wherein, display described image includes aobvious Show the multiple images of one of the gray level in the range of each having from minimum gray level to highest gray level, and
The abnormal mass is detected including described different in the multiple piece to detect on each gray level in the gray level Normal block.
3. the method for the local dimming of liquid crystal display device according to claim 2, wherein, calculate for the abnormal mass Light modulation value include calculating the light modulation value for the abnormal mass on each gray level in the gray level.
4. the method for the local dimming of liquid crystal display device according to claim 1, wherein, detecting the abnormal mass includes The brightness of each block in the multiple piece is measured by scanning the liquid crystal display panel of display described image.
5. the method for the local dimming of liquid crystal display device according to claim 4, wherein, detecting the abnormal mass includes The block with the brightness different from the brightness measured from reference block in the multiple piece is detected as abnormal mass.
6. the method for the local dimming of liquid crystal display device according to claim 5, wherein, calculate for the abnormal mass Light modulation value light modulation value for the abnormal mass is calculated including the use of below equation：
Light modulation value=(from the brightness of abnormal mass measurement/from the brightness of reference block measurement) for abnormal mass × it is used for reference block Light modulation value.
7. the method for the local dimming of liquid crystal display device according to claim 5, wherein, the reference block is described more The block at the center of the liquid crystal display panel in individual block.
8. the method for the local dimming of liquid crystal display device according to claim 5, wherein, the reference block be have with The block of lower brightness：The brightness is corresponding with from the mode in the multiple piece of brightness measured respectively.
9. a kind of liquid crystal display device, including：
Include the liquid crystal display panel of multiple pixels；
Back light unit including multiple light sources；And
Local dimming unit, it include storage for the liquid crystal panel multiple pieces of gray level light modulation value memory and The back light unit is driven based on the gray level light modulation value,
Wherein, the memory storage be used for the multiple piece in occur light leakage or black even defect abnormal mass with And the different gray level light modulation values of reference block.
10. liquid crystal display device according to claim 9, wherein, the local dimming unit is configured to：
Receive the input data of the liquid crystal display panel；
The typical value of each block in the multiple piece is set based on the input data；
Based on the light modulation value corresponding with the typical value, the back light unit is controlled on each block in the multiple piece；
Light distribution data based on the multiple light source calculate the yield value for the multiple pixel；And
The input data is compensated based on the yield value.
11. liquid crystal display device according to claim 9, wherein, the number of the abnormal mass is from the LCD The center of plate increases to edge.
12. liquid crystal display device according to claim 9, wherein, the liquid crystal display panel is plane conversion panel.
13. liquid crystal display device according to claim 9, in addition to：
For the timing controller for the driving for controlling the liquid crystal display panel,
Wherein, the local dimming unit is included in the timing controller.
14. liquid crystal display device according to claim 9, wherein, if being shown on the liquid crystal display panel has The image of single gray level, then measure identical brightness value from the multiple piece.
15. a kind of method of the local dimming of liquid crystal display device, including：
Image of the display with single gray level on liquid crystal display panel；
Measure multiple pieces of brightness of the liquid crystal display panel；And
The light modulation value for the central block in the multiple piece and edge block is calculated,
Wherein, calculating light modulation value should including the edge block to the central block and the leakage of generation light or black even defect With different light modulation values.
16. the method for the local dimming of liquid crystal display device according to claim 15, wherein, to the central block and institute State edge block includes independently applying light modulation value to each edge block in the edge block using different light modulation values.
17. the method for the local dimming of liquid crystal display device according to claim 16, wherein, in the edge block Each edge block independently includes using the light modulation value：First light modulation value is applied to some edge blocks, and to other sides Edge block applies the second light modulation value different from the first light modulation value.
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